able to switch to backup, to on site diesel generators. remember, the earthquake that hit japan was offshore. the tsunami caused by the earthquake didn't hit shore until about an hour after the big quake. so at 2:46, after the quake, but before the tsunami, the reactor is shut down. right? and they lost power. but their on site generators were working to keep the thing cool. but then 55 minutes later at 3:41 local time, a second announcement came from that plant. now the backup generators were out, too. we don't know if they were knocked out by the tsunami, timing seems right, but the backup power source failed. then the daiichi was back to the battery powered. and that only lasts until the batteries hold out, if they can't be recharged. the stakes are high. if they cannot keep power onto keep water circulating through the cooling system around the nuclear core, it will evaporate the water around it, the core will be exposed, and it will melt down, and that is very bad. authorities initially evacuated a two mile radius around the plant. then extended that evacuation area to six